*
     * @return an OptionalEntity containing the override configuration path if set and running in Docker,
     *         or empty OptionalEntity otherwise
     */
    public static OptionalEntity<String> getOverrideConfPath() {
        if (FESS_APP_DOCKER.equalsIgnoreCase(getAppType())) {
            final String confPath = System.getenv(FESS_OVERRIDE_CONF_PATH);
            if (StringUtil.isNotBlank(confPath)) {

        cmdList.add(fessConfig.getJavaCommandPath());

        // -cp
        cmdList.add("-cp");
        final StringBuilder buf = new StringBuilder(100);
        ResourceUtil.getOverrideConfPath().ifPresent(p -> {
            buf.append(p);
            buf.append(cpSeparator);
        });
        final String confPath = System.getProperty(Constants.FESS_CONF_PATH);

        cmdList.add(fessConfig.getJavaCommandPath());

        // -cp
        cmdList.add("-cp");
        final StringBuilder buf = new StringBuilder(100);
        ResourceUtil.getOverrideConfPath().ifPresent(p -> {
            buf.append(p);
            buf.append(cpSeparator);
        });
        final String confPath = System.getProperty(Constants.FESS_CONF_PATH);

        assertTrue(appType.isEmpty() || appType.length() > 0);
    }

    public void test_getOverrideConfPath() {
        // Test when app type is not docker
        OptionalEntity<String> confPath = ResourceUtil.getOverrideConfPath();
        assertNotNull(confPath);
        // Should be empty when not docker app type
        if (!"docker".equalsIgnoreCase(ResourceUtil.getAppType())) {
            assertFalse(confPath.isPresent());
        }

        cmdList.add(fessConfig.getJavaCommandPath());

        // -cp
        cmdList.add("-cp");
        final StringBuilder buf = new StringBuilder(100);
        ResourceUtil.getOverrideConfPath().ifPresent(p -> {
            buf.append(p);
            buf.append(cpSeparator);
        });
        final String confPath = System.getProperty(Constants.FESS_CONF_PATH);